Preparation method of phosphoric acid modified titanium dioxide photocatalyst

Abstract

The invention discloses a preparation method of a phosphoric acid modified titanium dioxide photocatalyst. The preparation method is characterized in that the visible light absorption rate of titanium dioxide is improved by adopting phosphoric acid. The preparation method mainly comprises the following steps: (a) preparing titanium dioxide powder, slowly and dropwise adding an organic compound of titanium to an ice-bath, sufficiently stirring and uniformly mixing to generate a white precipitate, wherein the volume ratio of the organic compound of titanium to water is 1: 0.1-5, the organic compound of titanium is a mixture of tetrabutyl titanate, tetraisopropyl titanate and tetraethyl titanate mixed at a proportion of 1: 1: 1; then adjusting the pH value of the mixture to be between 5 and 9 by using ammonia water after stirring, and filtering the obtained white precipitate; (b) adding the titanium dioxide powder to a phosphoric acid solution with the concentration of 0.1-0.3 mol / l, then sufficiently stirring mixed liquid and heating so that the mixed liquid is boiled and concentrated, drying for ashing to obtain loosened blocks; (c) grinding the loosened blocks into powder, putting in a neutral atmosphere at the temperature of 500-550 DEG C for roasting for 1-8 hours so as to obtain the phosphoric acid modified titanium dioxide photocatalyst. The catalyst prepared by the method is high in visible light absorption rate.

Description

technical field [0001] The invention relates to a preparation method of phosphoric acid modified titanium dioxide photocatalyst. Background technique [0002] It is known that photocatalysts composed of anatase-type titanium dioxide can be used for various purposes such as antibacterial tiles, self-cleaning building materials, super-hydrophilic materials, deodorizing / deodorizing materials, water purification, and cancer treatment. Development is actively underway. However, for anatase carbon dioxide, ultraviolet light below 400 nm is required for excitation. On the other hand, sunlight and artificial light that can be used as excitation light sources contain much more visible light than ultraviolet rays. Unfortunately, the above-mentioned photocatalyst composed of titanium dioxide can hardly be said to make good use of visible light, and is very inefficient from the viewpoint of energy conversion efficiency. And this inefficiency becomes a big obstacle to practical use. ...

AI Technical Summary

Problems solved by technology

[0009] In addition, traditional TiO2 photocatalysts are mainly used in powder dispersion suspension systems, and suspension systems have disadvantages such as difficult separation and recovery, and easy aggregation.

Poor reproducibility and high operating costs, so it is limited to laboratory research and has not been applied to production practice